Improved roller-stop for window-shades



teniet sata @ggw @met @fina www mw- I. E. PALMER, OF HACKENSACK, NEW JERSEYVl Letters Patent No. 88,200, dated March 23, 1869.

IMPROVE!) ROLLER-STOP FOR WINDOW-SHARES.

The Schedule referred to :ln these Letters Patent and making part of the name To all whom it mayfconcem:

Be it known that I, I. E. PALMER, of Hackensack, in the county of Bergen, and State of New Jersey, have invented a new and improved Roller-Stop for Window-Shades and other purposes; and I do hereby declare that the following is a full, clear, and exact descriptionof the same, reference being had to the accompanying drawings, which form part of this specifi-` cation, and in which- I Figure 1 represents a longitudinal section of aportion of a window-'shade roller provided with my rollerstop, and e Figure 2 is an end view of the same, representing the said roller-stop with its enclosed end removed.

Similar letters of reference indicate corresponding parts in both figures.

This invention, though more especially designed for the rollers of window-shades, is also applicable to rollers of various kinds. Its object is the holdingin check of the roller, when the turning thereof is not desired, and,` in the case of a window-shade, the supporting of the weight ofthe unrolled port-ion of the shade at any degree of elevation to which it may be rolled thereon, or suspended therefrom, and the prevention of the accidental descent of said shade, by its own weight, at all times.

The invention consists ina roller-stop of novel character, whereby the rapid rotation of the roller, caused by the falling, -or rapid descent of the shade, or other article attached thereto, serves to operate the stop, and

check the roller; but, during the gradual lowering'of the shade by hand, the stop is inoperative.

Referring to the accompanying drawings- A is a portion of the roller of a window-shade, and

B, the bracket containing its journal-bearing.

Near one end of the roller A, and within the socket h, on which one of the journals 'i is formed, and which is fitted and secured on the end of the roller, is made a transverse opening, or hole, a, intersecting the axis; and in this hole there is arranged, to slide loosely, a pin, or bolt, b, upon which the force of gravity will act, to produce its longitudinal reciprocating motion during the rotating of the roller at a moderate speed.

The bracket B has formed upon it a disk, c, from the inner side of which there projects a rim, d, which encircles the socket h andpin, or bolt b, and prevents the'dropping out of the latter during its reciprocating or sliding motion.

On the inner surface of this rim d, and at, ornear the uppermost part thereof, is an inwardly-projecting abutment, e, to form an abrupt shoulder, or stop, thev face of which is presented in a forward direction; and, n rear of this shoulder, or stop, the inner surfaceof the rim d has a scroll-like eccentricity, of such form, shown at j in g. 2, that, while the said surface terminates in the edge of the shoulder, it recedes from the axis in a backward and downward direction.

After the roller has ,been turned slightly forward, in a direction to lower the shade', by means of a cord attached to its other end, andwinding up on the small barrel, or pulley attached to the opposite axle, the pin b drops, by gravitation, from in front of the stop e,

and, when the cord is slackened, or let back gently, tov

unroll and lower kthe shade, the pin will drop to the bottom of the rim every time it comes to a vertical position, and so will be prevented from coming in contact with the faceof the shoulder, and interfering with the lowering of the shade; but, when the cord is let go, and the roller commences to be rotc ted rapidly, by the weight of the shade, the pin b, dying out from the axis of the roller, comes in contact with the stop e, and at once stops the further rotation of the roller and descent ofthe shade, and afterward continues to beheld by the friction within the hole a, and to be held up against the stop, and prevents the rotation of the roller and descent of the shade.

In the turning of the roller in a direction to roll up the shade, the pin b is rendered inoperative to stop the rotation of the roller, no matter atl what speed the roller is turned, for, if the rotation be so rapid that the force of gravitation is insufficient to prevent the pin from being thrown out from the axis of the roll by centrifugal force, and so to cause the piu to drop as it approaches the shoulder c, the pin, by passing in contact with the eccent1ic'-surface j, will be depressed as it arrives near the shoulder c, and so enabled to pass it. y e

The interior of the rim (l may be made concentric with the bearing ofthe roller, with a simple rib, or projectio11,'to form the stop-shoulder e but, in such case, the roller must be turned, or allowed to turn, only slowly in winding up as well as in letting down the shade, that the centrifugal force may be prevented from throwing the pin b into contact with the said shoulder.

The hole a, for the reception of the pin b, may extend only partly through the socket h, or roller; but, in suoli case, the pin-would only come to a position to stop the roller once in every revolution; but, when it extends through, as described, the pin comes to such position twice in every revolution.

What I claim as my invention, and desire to have secured by Letters Patent, is-

The abutment, or stop-shoulder e, on the .inner periphery of the eccentric-surface j of the rim, or barrel (l, in combination with the bolt, or pin b, al1 arranged andA operating substantially `as shown and described.

I. E. PALMER.

Witnesses:

F. HAYNES, J. W. OooMBs. 

